Springer Online Journal Archives 1860-2000
Abstract The responses of captive immature female common gobies, Pomatoschistus microps, to photoperiod at 18 °C were examined. This species responded to long daylengths with greater gonadal growth and more advanced sexual maturation than when exposed to short daylengths. However, there was no obligatory photoperiodic requirement since sexual maturation occurred after prolonged continual exposure to short daylengths. The possible role of an endogenous circadian sensitivity to light was examined, using 'resonance' lighting experiments. There was no consistent evidence for the presence of any such underlying process.
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